Uncheck everything except "Cache," and click "Clear Now." That's it you're good to go!.Answer any removal confirmation prompts, and allow the program to be removed.
When it's done, find "Microsoft Silverlight" in the list, and double-click it. Be patient as the list of programs is filled in.Click on "Programs and Features." If you don't see that option, first change the menu at the top right to "Small Icons.".From your Windows menu select "Control Panel" (or "Settings→Control Panel").Note: If you finish this and it still appears that Firefox doesn't have Silverlight installed, go to Firefox's Tools → Add-Ons menu, select "Plugins" from the left, and make sure that Silverlight is enabled. Uncheck everything except "Cache," and click "Clear Now." That's it you're all set!.If you don't see a listing with checkboxes below, click on the black "Details" triangle to show them.Select "Everything" for the time range to clear.Start up Firefox again, and select "Tools→Clear Recent History." (If you only have one "Firefox" menu, instead select "Firefox→History→Clear Recent History…".).Click on "Application Storage" and ensure that the "Application Storage" checkbox is checked, and close out of Silverlight.From the Start menu select "All Programs→Microsoft Silverlight/Microsoft Silverlight.".When the download is complete, double-click it in your Downloads window, and confirm that you want to install it.